Dear Arnab, Thank you very much for your reply. It does not give an error message. The problem is that predict does "work and predict" on the old data and does not make the predictions with the provided new data. Best, Martin
Gesendet: Mittwoch, 29. April 2015 um 16:51 Uhr Von: "ARNAB KR MAITY" <arnab_s...@yahoo.com> An: "Martin Spindler" <martin.spind...@gmx.de>, "r-help@r-project.org" <r-help@r-project.org> Betreff: Re: [R] Problem with predict.lm() Hi, It seems to be working in my R. Although it is throwing the warning message Warning message: 'newdata' had 200 rows but variables found have 100 rows y [1] -1.071307580 0.102414204 -0.965046207 1.386057875 0.726835339 [6] -0.186549950 -0.777144258 1.137210314 -1.069446945 -0.696084338 [11] -0.467686285 0.997316781 0.776265490 -1.385720997 -0.007438381 [16] 0.302821728 0.024075173 -0.590401970 0.877104292 0.652724314 [21] 2.142135078 2.023051454 -0.547221960 0.342600702 0.080848203 [26] 0.074609232 0.255946197 -0.191242759 1.036445108 0.895068954 [31] 0.589477883 0.123230750 1.467210735 -1.636657283 -0.131504288 [36] -0.665000122 0.390977868 0.546802014 0.445498091 1.063872749 [41] 1.406788635 -0.037147550 -1.047190960 -0.189105987 0.069617165 [46] -0.049760285 -1.454279226 0.358351554 0.246587937 -0.060735329 [51] 1.664530111 -0.475931484 0.405480604 1.560446941 -0.030537155 [56] -1.060319583 -1.828624216 -0.429391165 0.301697744 -0.029593593 [61] -1.696307754 0.342678986 -0.433965195 -0.947338037 0.318186677 [66] 0.539630789 -1.354555193 0.086168702 0.002950100 1.783486665 [71] -1.182419158 -0.930524123 0.376579158 -1.085035387 1.186125702 [76] 0.719738391 -0.486692820 -2.105396602 0.531238276 1.302812739 [81] 0.347851244 0.016452693 0.417535566 0.277705766 2.286275977 [86] 1.610183518 2.032037030 1.319074179 1.129375593 0.176684807 [91] -0.630517144 1.302785450 0.994275267 -0.060116993 -0.655966924 [96] 1.628197169 1.935532651 -1.635783346 -1.172511179 1.238336597 > ynew 1 2 3 4 5 6 -0.270916637 0.169149841 0.191348061 -0.009541999 0.112027155 0.016242323 7 8 9 10 11 12 -0.062178365 0.275322344 0.397030485 0.565078468 0.301230303 0.305405674 13 14 15 16 17 18 0.552136794 -0.151275710 0.470280882 0.349631748 0.022005869 0.181384646 19 20 21 22 23 24 0.143719339 0.478791323 0.518731127 0.229860133 -0.199433324 0.310576455 25 26 27 28 29 30 0.127612633 -0.157347145 0.413807523 0.007961485 -0.288867750 0.208759771 31 32 33 34 35 36 0.286165027 0.299492579 0.197312294 0.135601904 0.452828662 0.187191405 37 38 39 40 41 42 0.335596502 -0.109960231 -0.303770506 -0.276385255 0.429700474 0.003930969 43 44 45 46 47 48 0.184186301 0.140858190 0.479882236 0.182523553 -0.133845870 0.443940376 49 50 51 52 53 54 0.070571673 -0.383780163 0.362153269 0.202527841 0.164299813 0.327998904 55 56 57 58 59 60 0.047612361 -0.032167295 0.060976285 0.231929803 -0.449532973 0.109925656 61 62 63 64 65 66 0.468842330 0.108507841 0.158697337 -0.125813680 0.501159861 0.101646132 67 68 69 70 71 72 0.194383106 -0.006185569 0.354467348 0.340013811 0.088757961 0.439984356 73 74 75 76 77 78 0.330976669 0.449337326 0.081841142 -0.190123754 0.337794560 -0.111895039 79 80 81 82 83 84 0.598231564 0.444399789 0.388313945 0.244270482 0.200026237 0.009025077 85 86 87 88 89 90 0.341093767 -0.164196034 0.825849472 0.325975911 0.494473323 0.270037159 91 92 93 94 95 96 0.369787280 0.247455471 0.282701738 -0.541688411 -0.145796547 0.073172268 97 98 99 100 0.685833173 -0.079174316 -0.193161949 -0.137517175 Arnab Kumar Maity Graduate Teaching Assistant Division of Statistics Northern Illinois University DeKalb, Illinois 60115 U.S.A ------------------------------------------------------------ From: Martin Spindler <martin.spind...@gmx.de> To: r-help@r-project.org Sent: Wednesday, April 29, 2015 9:21 AM Subject: [R] Problem with predict.lm() Dear all, the following example somehow uses the "old data" (X) to make the predictions, but not the new data Xnew as intended. y <- rnorm(100) X <- matrix(rnorm(100*10), ncol=10) lm <- lm(y~X) Xnew <- matrix(rnorm(100*20), ncol=10) ynew <- predict(lm, newdata=as.data.frame(Xnew)) #prediction in not made for Xnew How can I foce predict.lm to use use the new data? Thank you very much for your efforts in advance! Best, Martin ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help[https://stat.ethz.ch/mailman/listinfo/r-help] PLEASE do read the posting guide http://www.R-project.org/posting-guide.html[http://www.r-project.org/posting-guide.html] and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
